Cheesy bacon potatoes

8-10 medium potatoes, peeled, diced and cooked until tender
1 16 oz pkg of medium cheddar cubed
1/2 cup onion diced
1-11/2 cups Mayonaise
1/2 lb bacon cooked crisp and crumbled
1/4-1/2 cup of sliced green olives

Mix potatoes, cheese, onion, together, add enough mayo to make the mixture look creamy. Spread into a 13 x 9 inch casserole dish, sprinkle with olives and bacon. Bake at 350 for about 30 minutes